But favorite part of their annual guide to cheap travel is where they break down when to book flights to each region. I've listed their full guide to cheap flights below. They also have some great overall insights into the industry.

Here's the best time to book your tickets to each world region, according to Kayak. Big holidays like New Year's Eve, Thanksgiving or spring break will have their own windows for booking the best airfare, but this gives you a good idea of when to start looking for flights depending on where you want to go in 2019.